CMX7031 Analogue Radio Baseband Processor with RF Synthesisers

The CMX7031 is a full-function, half-duplex, audio, signalling and data processor IC. This makes it a suitable device for both the leisure radio markets (FRS, MURS, PMR446 and GMRS) and for professional radio products (PMR/LMR and Trunking) with or without signalling and data facilities. The device utilises CML's proprietary FirmASIC® component technology. On-chip sub-systems are configured by a Function Image#trade: this is a data file that is uploaded during device initialisation and defines the device's function and feature set. The Function Image™ can be loaded automatically from an external EEPROM or from a host μcontroller over the built-in C-BUS serial interface. The device's functions and features can be enhanced by subsequent Function Image™ releases, facilitating in-the-field upgrades. This document refers specifically to the features provided by Function Image™ 1.2. The CMX7031 features two on-chip RF synthesisers, with easy Rx/Tx frequency changeover, and programmable system clocks to minimise chip count in the final application. When loaded with Function Image™ 1.2 this device performs simultaneous processing of subaudio and inband signalling and audio band processing (including frequency inversion scrambling, companding and pre- or de-emphasis).
Other features include a complete FFSK/MSK modem for packetised or free-format data, two Auxilliary ADC channels with four selectable inputs and up to four auxiliary DAC interfaces (with an optional RAMDAC on the first DAC output, to facilitate transmitter power ramping). The device has flexible powersaving modes and is available in both LQFP and VQFN packages.